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F921- Trifold (1)

STI F921®

F921® aboveground storage tanks are manufactured with a double‐wall steel design. Standard features include built‐in, testable, interstitial monitoring capability and impermeable secondary containment. The F921® delivers uncompromising performance, reliability, service and economy.

 

 

WATCO TANKS

F921® Features:

F921 (3)
  • Meets UL 142, Standard for Steel Aboveground Tanks for Flammable and Combustible Liquids
  • The double-wall design offers integral, impermeable secondary containment to meet EPA SPCC requirements
  • Primary and secondary tanks can be tightness tested on site with standard testing procedures, or the manufacturer may ship with a vacuum in the interstice to prove integrity of both walls during installation
  • Interstitial space can be monitored for leak detection
  • Primary storage tank and secondary containment compatible with a wide range of fuels and chemicals

Compatible With a Wide Range of Fuels and Chemicals, Including Biodiesel and Ethanol

Additional Features:

  • Support designs available for all seismic requirements
  • Choose from many integral support types, including saddles and skids
  • Capacities range up to 35,000 gallons

F921® Benefits:

  • Steel construction allows for recycling
  • Low-cost compartments and customization
  • Built to nationally‐recognized STI Standards with strict third‐party quality control inspection program
skid tank (1)-1
Available Designs:
  • Horizontal
  • Rectangular
  • Vertical
Economical Double-Wall Design
Watco Tanks

F921® Double-Wall Aboveground Steel Storage Tanks

  • Steel Tank Institute F921® and Listing Labeled
  • 300° or 360° outer wall for secondary containment
  • Variety of Listed supports available
  • Compatible with a wide range of fuels and chemicals
  • Capacities range up to 35,000 gallons
  • Easily relocated
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F921® Guideline Specification

 
General
  1. Provide F921® double‐wall steel aboveground storage tanks.

Labeling
  1. Tanks shall bear the Steel Tank Institute F921® Double‐Wall Aboveground Storage Tank identification label.

Manufacturer
  1. The manufacturer shall be a licensed member company of the Steel Tank Institute and subject to Steel Tank Institute’s Quality Assurance program.
Product Description
  1. Tanks shall be manufactured in accordance with Steel Tank Institute F921® , Standard for Double‐Wall Aboveground Storage Tanks.
  2. Aboveground tank primary and secondary containment (inner and outer walls) shall be manufactured in accor‐ dance and listed with Underwriters Laboratories UL 142, Standard for Steel Aboveground Tanks for Flammable and Combustible Liquids.
  3. Tanks shall be double‐wall with a steel inner wall for primary containment and provide integral secondary containment by an impervious steel outer wall.
  4. Integral secondary containment shall be testable and provide access for interstitial leak detection monitoring.
  5. Listed supports shall be used for all horizontal, rectangular and vertical double‐wall tanks. Supports are designed for seismic loading, if necessary.

Trusted Watco Tanks Affiliates

Watco Tank Manufacturing Shot

Top U.S. Producer of STI Technologies

Watco Tanks was recognized as the largest U.S. producer of STI Technologies in 2021 and the second-largest worldwide, with over 5 million gallons built in 2021 and over 6 million gallons each in 2022 and 2023.

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